计算（）列车每百吨列车重量换算闸瓦压力时，不包括机车。A、旅客 B、特快行邮 C、快

接着填。

7+6→（   ）-9→（   ）+3→（   ）+6→（   ）-9→（   ）+10→（   ）-9→（   ）+8→（   ）-5→（   ）+4→（   ）

阅读理解。  

     Here is a part of an E-mail answer from Joe giving some advice to his son in college. When I was

young, I often met troubles about what to do and what not to do. My grandmother told me not to worry

about those things. I only did once a year or once a lifetime. Instead, I should try to do those things well,

and I do them every day. For example, I need to eat every day, so I should learn how to cook. I need to

talk to others every day, so I should learn how to work with different people and how to speak well. I

walk every day, so my shoes should be all right and comfortable. Every night I sleep, so my bed should

let me have a good rest. Taking care of the everyday things means that you do a better job of the

one-in-a-lifetime things as well.

根据短文内容，回答下列问题。

l. Who receives this part of E-mail?

  _______________________________________________________________________________

2. What advice did the E-mail give?

  _______________________________________________________________________________

3. What trouble do you think the young man met?

  _______________________________________________________________________________

4. What kind of father do you think Joe is?

  _______________________________________________________________________________

某生物的体细胞中含有12对染色体，细胞分裂后形成的每个子细胞中，染色体的数目是

A．12条

B．24对

C．12对

D．6对

肾动脉粥样硬化的描述哪项是错的

A．病变常累及肾动脉开口处

B．病变可累及叶间动脉

C．常引起高血压

D．不会引起肾梗死

E．可以引起肾梗死

必须亲自从停车调度员中接取调车作业计划。